JS: Iterator.prototype

What is Iterator.prototype

Iterator.prototype is the value of the property key "prototype" of the function Iterator. 〔see Iterator Object〕

console.log(Object.hasOwn(Iterator, "prototype"));

Type

Type of Iterator.prototype is Object .

console.log(typeof Iterator.prototype === "object");

Parent

Parent of Iterator.prototype is Object.prototype .

// parent of Iterator.prototype
console.log(Reflect.getPrototypeOf(Iterator.prototype) === Object.prototype);

Purpose

Allow all standard Iterable objects to have methods such as map, forEach, filter, etc, without having to convert to array first. Similarly, modify given Iterator to return a new iterator.

Properties

constructor

value is Iterator

console.log(Iterator.prototype.constructor === Iterator);
// true

• JS: Iterator.prototype.map
• JS: Iterator.prototype.forEach
• JS: Iterator.prototype.filter
• JS: Iterator.prototype.reduce
• JS: Iterator.prototype.take
• JS: Iterator.prototype.drop
• JS: Iterator.prototype.every
• JS: Iterator.prototype.some
• JS: Iterator.prototype.find
• JS: Iterator.prototype.flatMap
• JS: Iterator.prototype.toArray

• Symbol.iterator
• Symbol.toStringTag